minishift: Virtual Switch not found with Hyper V on Windows

General information

• Minishift version: v1.20.0+1bd6d5c
• OS: Windows
• Hypervisor: Hyper-V

Steps to reproduce

1. Install Hyper V feature on Windows 10
2. Copy minishift.exe to C:\minishift and add it to PATH
3. Add to environment variables a MINISHIFT_USERNAME and MINISHIFT_PASSWORD with my OpenHat subscription credentials
4. On git bash run minishift start --memory 8G --cpus 2

Expected

Openshift starting correctly

Actual

Checking if Hyper-V driver is configured to use a Virtual Switch ...
   'ExternalVmSwitch' ... FAIL

Logs

-- minishift version: v1.20.0+1bd6d5c
-- Starting profile 'minishift'
-- Check if deprecated options are used ... OK
-- Checking if https://mirror.openshift.com is reachable ... OK
-- Checking if requested OpenShift version 'v3.9.31' is valid ... OK
-- Checking if requested OpenShift version 'v3.9.31' is supported ... OK
-- Checking if requested hypervisor 'hyperv' is supported on this platform ... OK
-- Checking if Hyper-V driver is installed ... OK
-- Checking if Hyper-V driver is configured to use a Virtual Switch ...
   'ExternalVmSwitch' ... FAIL
   See the 'Setting Up the Virtualization Environment' topic (https://docs.openshift.org/latest/minishift/getting-started/setting-up-virtualization-environment.html) for more information

Things I tried:

• As per https://docs.openshift.org/latest/minishift/getting-started/setting-up-virtualization-environment.html I created a Virtual Switch on Hyper-V Manager as External, associated to my wireless network card and called ExternalVmSwitch
• As per https://github.com/minishift/minishift/issues/2635 created an environment variable MINISHIFT_HYPERV_VIRTUAL_SWITCH with value ExternalVmSwitch because I tried with HYPERV_VIRTUAL_SWITCH and the logs said it was deprecated.
• As per https://docs.openshift.org/latest/minishift/getting-started/setting-up-virtualization-environment.html I run minishift config set hyperv-virtual-switch "ExternalVmSwitch" or minishift config set hyperv-virtual-switch ExternalVmSwitch and in any case I get a [Virtual Switch not found]

No luck, same result. What am I missing here?